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J H ROSENTHAL SUPBRHEATER FOR STEAM GENERATORS.

No. 597,887. Patented Jan. 25, 1898.

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SUPERHEATER FOR STEAM GENERATORS. No. 597,887. Patented Jan. 25, 1898.

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J. H. ROSENTHAL. SUPERHBATEE FOR STEAM GENERATORS.

No. 597,887. Patented Jan. 25,1898

(No Model.) 7 4 Sheets-Sheet 4.

' J. H. ROSENTHAL.

SUPERHBATER FOR STEAM GENERATORS. No. 597,887. Patented Jan. 25,1898,

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' UNITE drains JAMES H. R OSENTHAL, OF LONDON, ENGLAND.

SUPERHEATER FOR STEAM-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 597,887, dated January25, 1898.

Application filed March 1 3, 1 8 9 7- To all whomit may concern.-

Be it known that 1, JAMES H. ROSENTHAL, a subject of the Queen of GreatBritain, residing at London, England, have invented a new and usefulImprovement in Super-heaters for Steam-Generators, of which thefollowing is a specification, taken in connection with the accompanyingdrawings,in which- Figure 1 is a vertical section of a watertubesteam-generator with the invention applied; Fig. 2, a sectional endelevation; Fig. 3, a side view; Fig. 4, a side view of pipe and valveattachment for regulating the circulation of the water; Fig. 5, a planview, and Fig. 6 an end view, of the same.

vThe superheating apparatus is composed of two cross-boxes A A,preferably of wroughtiron or steel, arranged within thecombustionchamber C, substantially as shown, and connected by a numberof long tubes a, bent to U or other shape, the bent portion projectinginto the combustion-space and presenting a large surface for theabsorption of heat. The upper cross-box A has connected to it a verticalpipe B, which passes into the drum D and terminates in a perforatedcross-pipe B. The lower cross-box A is connected by vertical tubes Awith a third cross-box or chamber A resting on the top of the drum D andwhich supports the apparatus and serves as a collector of the dry andsuperheated steam. E represents a steam-delivery pipe attached to thecollector A and is provided with a stopvalve F.

The ends of the vertical tubes A are preferably expanded into thecross-boxes A and A thus avoiding flanged and bolted connections.

With the construction and arrangement described the saturated steam fromthe drum D passes through the perforated cross-pipe B into pipe B andcross box A, and thence through the bent tubes a into the cross-box Aand upward. through the tubes A to the collector AF, it beingsuperheated during its passage.

In order to maintain a circulation of water while the steam is beingraised and avoid damage to the apparatus by the action of the fire, Iconnect to the cross-boxes A A pipes g g, which are also connected to apipe G, attached at one end to the drum D and its other end either leftopen or connected to a steamtrap. A two-Way cock is provided at thejunction of the pipe 9 with the pipe G and a three-way cock at thejunction of the pipe 9, the pipe G being also provided with a stopvalveI. By opening these cocks water is admitted from the drum D into thecross-boxes A A and tubes (4, thus maintaining a circulation While steamis being raised.

When it is desired to pass steam through the superheater, it maybedrained by closing the valve I and turning the way-cocks upon the pipeG, which will be readily understood. This feature of the invention-thatof circulating the Water through the superheater during the generationof the steam-greatly increases its durability, facilitates theoperation, and enables the superheater to be used as auxiliaryboiler-heating surface.

In Fig; 3 theperforated pipe B is supplied with a casing 13, Withinwhich a ball Z) or other valve is placed, the object being to preventthe escape of steam in the event of the bursting of the superhcater, therush of steam automatically forcing the ball I) against the seat 19 andthereby shutting oi? the steam from the superheater. In this arrangementa separate pipe connection J with the drum D is provided, having astop-cock J to convey steam directly to the steam-pipe E for use. Amodification of this device which may be considered more convenient inuse is shown in Figs. 4, 5, and 6. The stop-cock I is open at its bottomand located at the side of the drum D and nearer the superheater and isfitted with a quadrant-plate c and handle d. When the handle cl isturned to the position marked Flood on the quadrant-plate, the waterfrom the drum D passes through the branch pipe 72 and the open bottom,through the pipe 2' of the cock 1', into the box A, thereby establishinga circulation, and any steam that is generated in the superheater willpass through the pipe 13 B into the drum D.

When it is required to drain the superheater, the handle cl is turned tothe position on the quadrant-plate marked Drain, which establishescommunication from the superhea'ter-tube a, through the open bottom ofthe cock I, to the outlets o. The handle (1 is thus brought to theposition on the quadrant-plate marked Shut, and steam can then be passedthrough the superheater.

